MODULE test_css ;

(*
   m2-GTK4 test - CSS styling: GtkCssProvider + provider-for-display +
   per-widget CSS classes.  Requires a display.
*)

FROM Gio IMPORT g_application_run, g_application_quit;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkWindow IMPORT gtk_application_window_new, gtk_window_set_child;
FROM GtkWidget IMPORT gtk_widget_add_css_class, gtk_widget_remove_css_class,
   gtk_widget_has_css_class;
FROM GtkLabel IMPORT gtk_label_new;
FROM GtkCssProvider IMPORT gtk_css_provider_new,
   gtk_css_provider_load_from_string;
FROM GtkStyleContext IMPORT gtk_style_context_add_provider_for_display,
   gtk_style_context_remove_provider_for_display,
   GtkStyleProviderPriorityApplication;
FROM Gdk IMPORT gdk_display_get_default;
FROM GtkUtils IMPORT Connect, Unref;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

CONST
   AppId = "org.example.m2gtk4.TestCss";

VAR
   app: ADDRESS;
   passed: BOOLEAN;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, label, provider, display: ADDRESS;
   ok: BOOLEAN;
BEGIN
   ok := TRUE;

   provider := gtk_css_provider_new();
   gtk_css_provider_load_from_string (provider,
      ".m2card { color: red; }");
   display := gdk_display_get_default();
   gtk_style_context_add_provider_for_display (display, provider,
      GtkStyleProviderPriorityApplication);

   label := gtk_label_new("styled");
   gtk_widget_add_css_class(label, "m2card");
   IF gtk_widget_has_css_class(label, "m2card") = 0 THEN
      printf("css class not applied\n");
      ok := FALSE
   END;
   gtk_widget_remove_css_class(label, "m2card");
   IF gtk_widget_has_css_class(label, "m2card") # 0 THEN
      printf("css class not removed\n");
      ok := FALSE
   END;

   gtk_style_context_remove_provider_for_display (display, provider);
   Unref(provider);

   window := gtk_application_window_new(application);
   gtk_window_set_child(window, label);

   passed := ok;
   g_application_quit(application)
END OnActivate;

VAR
   rc: INTEGER;
BEGIN
   passed := FALSE;
   app := gtk_application_new(AppId, 0);
   IF app = NIL THEN
      printf("test_css: FAIL (no app)\n");
      HALT(1)
   END;
   Connect(app, "activate", ADR(OnActivate), NIL);
   rc := g_application_run(app, 0, NIL);

   IF passed THEN
      printf("test_css: PASS\n");
      HALT(0)
   ELSE
      printf("test_css: FAIL\n");
      HALT(1)
   END
END test_css.